The WHO has paused recruitment to the hydroxychloroquine arm in their SOLIDARITY trial. The UK regulatory body, MHRA, requested the temporary pausing of recruitment into all hydroxychloroquine trials in the UK (treatment and prevention), and France has changed its national recommendation for the use of hydroxychloroquine in COVID-19 treatment and also halted trials.
And of course even when the paper had been retracted (and shown to be nothing but a hoax) the regulatory agencies maintained their recommendations re HCQ.
(One wonders who paid MR Mehra et al to write this paper. If we only had any real investigative journalists....)
And that was after tens of billions of doses had been taken worldwide for a number of maladies and the drug had exhibited an outstanding safety profile. Their finding was absolutely preposterous on its face. But, like apologies, retractions and corrections in the NYT buried at the bottom of page 47, the damage from the false p1 story that they sought was accomplished.